Radio apparatus



June 11, 1929. B ACKM I QE 1,716,538,

RADI O APPARATUS Filed Dec. 31, 1924 4 Sheets-Sheet 1 GMW June 1929. c.c. BLACKMORE RADIO APPARATUS Filed Dec 31, 1924 4 Sheets-Sheet 2 02.03 mlazin June 11, 1929.

c. c; BLACKMORE RADIO APAnA'rus Filed Dec. 31, 1924 4 Sheets-Sheet 3June 11; 1929. c. c. BLACKMORE RADIO APPARATUS Filed Dgc. 31, 19244Sheets-Sheet 4 FAWAINN w llivll Patented June. 11, 1929.

enamels c. BLACKMORE, oF nAY'roN, 01110.

RADIO arr'zma'rfis.

Application filed December 31, 1924; Serial No. 759,043.

My invention relates to radio apparatus It is a further object of myinvention to and in particular to receiving apparatus.

It is the object of my invention to provide a circular or cylindricalreceiving set enclosed within a semi-spherical cover.

It is a further object to provide for the adjustment of certain partsofthe receiving set such as the condensers by the relative movement ofthe semi-spherical cover and the base supporting a portion of theapparatus, thussecuring an adjustment and setting of the instrumentwithout the use of the usual dials and knobs which are dif-g ficult tosee, tedious to operate and confusing to a person of little scientificknowledge and experience.

. It is my object to provide a set which has great simplicity, ease ofadjustment, which will be self-contained and which will 00- cupy theminimum of space,

It is a further object to provide a cover which may serve the dualpurpose of a cover, and an adjusting means for the set.

It is a further object to provide such a cover which will reduce outsideinterferences or eliminate them substantially entirely.

It is an additional object of 'my invention to provide means forindicating the stations which can be secured by bringing the cover andbase into predetermined relationship so that once an adjustment is" madefor tuning in predetermined stations either at the factory where the setis manufactured or by the user, the same stations can be repeatedlysecured by merely turning the parts relative to one another so that apointer or the like will be placed opposite to the predeterminedposition of the station as indicated in plain language on the dialeither by wave length, symbol for the station or the name of the city inwhich the station is located. Thus it is possible to tune in on thestation desired by placing the pointer opposite the point where suchcity and station is marked onthe dial.

' It isa further object of my invention to provide an indicating meansin which said designations may be readily interchanged to take care ofchanges in wavelength, stations, etc.

' It is an additional object to provide suplementary adjustments such asa Vernier adustment and a detector rheostat adjustment. It is my objectto provide-simple evers for controlling such adjustments the apparatuscarried 'upon the base of the instrument being omitted for the purposeof clearness in the drawing;

Figure '3 is a section onthe line 33 of Figure 2; 1

Figure 4 is an elevatioh of one corner of the instrument showing amodified form of pointer location andscale of location;

Figure 5 indicates a section and fragmentary elevation of the preferredform of scale or indicating band having detachable strips for indicatingthe desired stations;

Figure 6 is a similar view showing a trans parent strip carrying thedesignations of the stations. upon if the designations are not placedbehind it;

Figure 7 is a section on the line 7-7 of Figure 1; v

Figure 8 is a typical diagram showing a system of wiring adapted tocarry out my fhis strip may' also*be written invention but I do notdesire to be confined to any particular wiring-arrangement of myinvention;

Figure 9 is a plan view of the'instrument board partially broken away to'shovg' ceras that has nothing to do withthe essentials.

of, I igure '10'is an elevation of the receiving set with a loopedantenna mounted thereon;

Figure 11 is a section on the'line 11- 1 1 of Figure 10 looking in thedirectionof. the

tain adjusting means below the level therenum, adapted to rotate above astationary base 2, which base forms the support for an instrumentboard.It also carries a standard 3 upon which .is

cover 1.

pivotally mounted the The lower margin of the cover 1 carries stations.This series of stations may be i11 (heated preferably by a series ofdetachable paper strips 4:placed beneath a band 5 cated on the lowermargin of the cover 1;

' This band has openings (5 for writing on the strips 4. The band may besupported by a turned up U-shaped edge 7 formed on the lower rim of thecover 1. I

If desired, instead of the band 5 with a series of spaced openings 6, Imay use a continuouastrip of-paper or the likes behind a. continuousstrip of celluloid 9, or the strip 9 may be ofsuch material that thedesignations may be. Written or printed or otherwise inscribed upon thestrip.

Such methods of mounting are suggestive but it is, ofcourse, obviousthat the designationsmay be imprinted upon the lower margin of thecoverl before it leaves the factory. Again, I desire'to comprehendwithin' my invention the relative movement of the baseand the cover sothat insome instances the base itself may be moved wlth the 'coverstationary, Again, it is possible, as I have shown in Figure 4, to mountthe pointer 10.

on the cover, locating the scale or indicating band or the indicationsin any desired fash ion on the banditself, as at-11..

Th'c'set may be adjusted at-the factoryso that-when the pointer andscale are brought-- to predetermined superimposed relationship the setwill be in adjustmentto receive from1 the stations so indicated on theindicating band or scale, or the owner-'ofthe'set may tune in-on thestations and upon doing so can then indicate the adjustin'ent of theparts so that the same adjustment to secure the same station may berepeatedly. gotten by simply bringing the scale-and pointer intopredetermined relationship.

, referring to Figure 3 it will be noted that the cover 1 is mountedupon a sleeve 12 and fastened thereto by a pin 13. This'pin also clampsawasher L1 in posltlon. A set screw 15 retains the scveral'parts inlocked ongagement. The. sleeve 12 (2111'163 integral post 3 on whichrotates the sleeve'12. 'Alset" screw-26' carried by: the sleeve '12projects into a groove 27 in the stationary standard therewith anactuating gear 16 having teeth 17 'meshi-ng with the condenser gears 18which are mounted on condenser gear shafts respectively designated 19.These shafts are journalled in the usual. end plates 20 and 21.

The condenser shaft 19'ca'rri'es a plurality. of condenser plates 22which rotate there with in the usual manner while the connecting shaft23 carries a plurality of'stati-onary condenser plates24. No claimismade to the particular formof condenser as this may v be widely varied.The condenser is mounted upon a bracket 25-"carried on the stationary 3to prevent the cover from being lifted off with the sleevefrom thestandard. If it is desired to remove the cover independently of thesleeve this may be effected by. loosening the set screw-15.

. It will be noted that'from the size of the gears that there isa two toone movement so that the desired rotation of theconden'sers andv the"desiredjadjustmentithereof ass-eon sequence maybe secured to'the fullextent by the rotation of the housing throughout.

the relative movement of the cover and base."

The base consists of an upper instrument board 28 and a lowerv plate orr ng 29 connected by a side wall 30 in which are the" slots 31 forpermitting" of the movement ofvarious handles such 1 as I, the Verniercondenser handle 32 and the adjusting Vernier condenser I generallydesignated The handle 34 of the detector. rheostat for controlling tubefilam'ent, temperature also projects through a slot in-tliewall 30'. Alever '35 is used "for controlling the: resistance which regulates thevolume of reception.

v The instrument. board carries any number or combination ofitems usedin sets which may vary from. time to time. A' typical in ,stallation isshown in Figures 8 and 9 where 36 indicatesthe tube sockets, 37 thelocation of audio frequency transformers, 38 tuning inductances, 39 aground binding post, 40 an antenna binding post, 41 and 42 the terminalsof theA batteries, 43 and 44 they termiv i nals of the vB batteries and45. and 46 the terminals of the C batteries: I

Referring to the supporting and mounting means .for the looped aerial asshown in 7 Figures wand 11, 1 is the housing or cover' mounted on thecollar 47 which is internally threaded at 48 to receive an externallythreaded sleeve 49 which serves to clamp the cover in position. Passingthrough this sleeve is the shaft '50 of insulating material carrying thewires 51 and 52 of the antenna.

This shaft passes downwardly through a second sleeve v53 which isthreaded into-the top of the insulating sleeve '54. This sleeve 53 hasan overlapping head 55 overlapping the head of a. sleeve 56 which isintegralwith both the'sleeve 47 and the gear 16; The

cut away at 58 and59 to expose the contact bands GO-an'd 61 on themember 50. The- "wires 51 and 52'respectively are in electrical contactwith the bands 60 and 61. These bands. are in constant engagement withthe I sleeve 56 is mounted on a shoulder 57 of the sleeve of insulatingmaterial 54 so that the spring fingers 62 and 63 fastened on thecolumn54 to which are attached wires 64 and 65 by set screws 66 and 67 68indicates the jack for the phones or loud speaker. It will be understoodthat I desireto comprehend within my invention such modifications as maybe necessary to adapt it'to varying conditions of use. I

Having thus fully described my invention,- what I claim as new anddesire to secure by Letters Patent, is

1. In a radio receiving set, a base, a revolving cover, means on saidbase to support said cover, means on the supporting means for supportinga condenser, means associated with the cover to actuate said condensercarried on said supporting means, whereby as the cover is rotated thecondenser is adjusted for reception of messages from various stations,and means associated with said cover and base for indicating the settingof the relative position of the cover and base and the condensernecessary for putting the setin communication with the desiredstationindicated, whereby as the cover is moved to a predeterminedposition indicated by desig nation of the station on the indicating 1means, the condenser will be so adjusted that messages will be receivedfrom that station. 2. In a radio receiving set, a base, asemicylindrical cover, a support for said cover, a sleeve carrying saidcover and rotatably mounted on said support, a gear fixed on saidsleeve, a variable condenser mounted on said support, a second gearassociated with the movable elements of the condenser for adjusting itand meshing with the first mentioned gear whereby as the cover isrotated the capacity of said'condenser is varied.

, 3. In a radio receivingset, a base, a. semicylindrical cover, asupport for said cover, a sleeve carrying said cover and rotatablymounted on said support, a: gear fixed on said sleeve, a variablecondenser mounted on said support, a second gear associated. with themovable elements ofthe condenser for adjustingit; and meshing with thefirst mentioned gear whereby as the cover is ro-' tated, the capacity ofsaid condenser is varied, and means carried on said set c0nsisting of ascale and pointer whereby when the pointer is brou ht to a predeterminedpoint over the scale t e condenser will be adjusted to receive a messagefrom such predetermined-station. I

4. In a radio receiving set, a base for supporting radio receivingapparatus such as tubes inductances, variable condensers, transformersand-thelike'and terminals for batteries, antennaand speakers or phones,a revolving cover operatively connected with said condenser adapted byits revolution to adjust the condensers to tune in a desired station, ascale on the revolvingscover indieating stations, and apointer-on thebase which when brought adjacent a predetermined -station on the coverscale will indicate the adjustment of the condensers for receivingmessages from that station. Y

5. In a radio receiving set, a base, a cover supported thereover androtatable relatively thereto, means within said cover carried by saidbase adaptedfor the selective reception of transmitted energy, meanscarried by said cover to adjust said selective reception means, wherebyif the cover is rotated relatively to the base the selective receptionmeans will be positioned to receive messages from various stations, andsupplementary means T carried by. said base for efiecting a fineradjustment of the selective reception means. 6. In a radio receivingset, a base, a cover supported thereover and rotatable relativelythereto, means within said cover carried by said base adapted for theselective reception of transmitted energy, means carried by said coverto adjust said selective reception means, and indicating means to guidethe operator in moving'the cover so that messages may be received fromthe desired station.

7. In a radio receiving set, a base, a cover supported thereover androtatable relatively thereto, means within said cover carried by saidbase adapted for the selective reception of transmitted energy, meanscarried by said cover to adjust said selective reception means, andmeans associated with said cover,

and base for indicating the setting of the relative position of thecover and base necessary for tuning in the desired station indicatedwhereby asthe cover is moved to a predetermined position indicated bydesignation of the station on the indicating means,

.the selective reception means will be so adjusted that messages will bereceived from 'the desired station.

8. In a radio receiving set, a base, a stand ard carried by said base, acover rotatably mounted on said standard, a gear carried by said cover,variable'condensers supported by said standard, shafts to carry themovable members of said condensers, gears mounted on said shafts andmeshing with the gear on said cover? the ratio'between the-gear carriedby the cover and the gears associated with the condensers being two toone, whereby one revolution of the cover will effect a completevariation in the capacity of. the condensers:

9. In a radio'receiving set, a volving cover, means for supporting saidcover, a gear associated with said 'cover,

a plurality of condensers, gears associated with said condensers andengaging the-gear of said cover whereby as the cover is rotated thecondensers are simultaneously adjusted/ 10:, In a radio receiving set, abase, a revolving cover, means for support ng said cover, a gearassociated with said cover, a

. base, a redetermined station is brought to a prede- "tionlof a messagefrom the station so inditermined point indicating a predetermined'TGlfitlOIlSlli]? between the cover and the base the condenser Wlll bearranged for the recepcatedon the indicating means at the predeterminedpoint of relationship between the cover and the base,

11 Ina radio, receiving stit, a base, a revolving cover, means forsupporting said cover, a gear associated with said cover, a plurality ofadmstable condensers, gears for said condensers meshing with the covergear whereby as the cover is rotated the condensers are simultaneouslyadjusted, and means associated with the base and revolving cover forindicating stat-ions whereby when a predetermined station is brought toa predetermined point indicating a predetermined relationship betweenthe cover and the base the condensers will be arranged for the receptionof a message from the station so indicated on the indicating means atthe predetern'nned point of relationship between the cover and the base,said base supporting a plurality of instruments for radio reception.

In testimony whereof, I affix my signature.

, CHARLES C. BLACKMORE.

